static void multipart_set_boundary (CamelMultipart *multipart, const gchar *boundary) { CamelDataWrapper *cdw = CAMEL_DATA_WRAPPER (multipart); gchar *bgen, bbuf[27], *p; guint8 *digest; gsize length; gint state, save; g_return_if_fail (cdw->mime_type != NULL); length = g_checksum_type_get_length (G_CHECKSUM_MD5); digest = g_alloca (length); if (!boundary) { GChecksum *checksum; /* Generate a fairly random boundary string. */ bgen = g_strdup_printf ("%p:%lu:%lu", (gpointer) multipart, (gulong) getpid (), (gulong) time (NULL)); checksum = g_checksum_new (G_CHECKSUM_MD5); g_checksum_update (checksum, (guchar *) bgen, -1); g_checksum_get_digest (checksum, digest, &length); g_checksum_free (checksum); g_free (bgen); strcpy (bbuf, "=-"); p = bbuf + 2; state = save = 0; p += g_base64_encode_step ( (guchar *) digest, length, FALSE, p, &state, &save); *p = '\0'; boundary = bbuf; } camel_content_type_set_param (cdw->mime_type, "boundary", boundary); }
static int sm_encrypt(CamelCipherContext *context, const char *userid, GPtrArray *recipients, CamelMimePart *ipart, CamelMimePart *opart, CamelException *ex) { struct _CamelSMIMEContextPrivate *p = ((CamelSMIMEContext *)context)->priv; /*NSSCMSRecipientInfo **recipient_infos;*/ CERTCertificate **recipient_certs = NULL; NSSCMSContentInfo *cinfo; PK11SymKey *bulkkey = NULL; SECOidTag bulkalgtag; int bulkkeysize, i; CK_MECHANISM_TYPE type; PK11SlotInfo *slot; PLArenaPool *poolp; NSSCMSMessage *cmsg = NULL; NSSCMSEnvelopedData *envd; NSSCMSEncoderContext *enc = NULL; CamelStreamMem *mem; CamelStream *ostream = NULL; CamelDataWrapper *dw; CamelContentType *ct; poolp = PORT_NewArena(1024); if (poolp == NULL) { camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, g_strerror (ENOMEM)); return -1; } /* Lookup all recipients certs, for later working */ recipient_certs = (CERTCertificate **)PORT_ArenaZAlloc(poolp, sizeof(*recipient_certs[0])*(recipients->len + 1)); if (recipient_certs == NULL) { camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, g_strerror (ENOMEM)); goto fail; } for (i=0;i<recipients->len;i++) { recipient_certs[i] = CERT_FindCertByNicknameOrEmailAddr(p->certdb, recipients->pdata[i]); if (recipient_certs[i] == NULL) { camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot find certificate for `%s'"), recipients->pdata[i]); goto fail; } } /* Find a common algorithm, probably 3DES anyway ... */ if (NSS_SMIMEUtil_FindBulkAlgForRecipients(recipient_certs, &bulkalgtag, &bulkkeysize) != SECSuccess) { camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot find common bulk encryption algorithm")); goto fail; } /* Generate a new bulk key based on the common algorithm - expensive */ type = PK11_AlgtagToMechanism(bulkalgtag); slot = PK11_GetBestSlot(type, context); if (slot == NULL) { /* PORT_GetError(); ?? */ camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot allocate slot for encryption bulk key")); goto fail; } bulkkey = PK11_KeyGen(slot, type, NULL, bulkkeysize/8, context); PK11_FreeSlot(slot); /* Now we can start building the message */ /* msg->envelopedData->data */ cmsg = NSS_CMSMessage_Create(NULL); if (cmsg == NULL) { camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot create CMS Message")); goto fail; } envd = NSS_CMSEnvelopedData_Create(cmsg, bulkalgtag, bulkkeysize); if (envd == NULL) { camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot create CMS Enveloped data")); goto fail; } cinfo = NSS_CMSMessage_GetContentInfo(cmsg); if (NSS_CMSContentInfo_SetContent_EnvelopedData(cmsg, cinfo, envd) != SECSuccess) { camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot attach CMS Enveloped data")); goto fail; } cinfo = NSS_CMSEnvelopedData_GetContentInfo(envd); if (NSS_CMSContentInfo_SetContent_Data(cmsg, cinfo, NULL, PR_FALSE) != SECSuccess) { camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot attach CMS data object")); goto fail; } /* add recipient certs */ for (i=0;recipient_certs[i];i++) { NSSCMSRecipientInfo *ri = NSS_CMSRecipientInfo_Create(cmsg, recipient_certs[i]); if (ri == NULL) { camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot create CMS Recipient information")); goto fail; } if (NSS_CMSEnvelopedData_AddRecipient(envd, ri) != SECSuccess) { camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot add CMS Recipient information")); goto fail; } } /* dump it out */ ostream = camel_stream_mem_new(); enc = NSS_CMSEncoder_Start(cmsg, sm_write_stream, ostream, NULL, NULL, NULL, NULL, sm_decrypt_key, bulkkey, NULL, NULL); if (enc == NULL) { camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot create encoder context")); goto fail; } /* FIXME: Stream the input */ /* FIXME: Canonicalise the input? */ mem = (CamelStreamMem *)camel_stream_mem_new(); camel_data_wrapper_write_to_stream((CamelDataWrapper *)ipart, (CamelStream *)mem); if (NSS_CMSEncoder_Update(enc, (char *) mem->buffer->data, mem->buffer->len) != SECSuccess) { NSS_CMSEncoder_Cancel(enc); camel_object_unref(mem); camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Failed to add data to encoder")); goto fail; } camel_object_unref(mem); if (NSS_CMSEncoder_Finish(enc) != SECSuccess) { camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Failed to encode data")); goto fail; } PK11_FreeSymKey(bulkkey); NSS_CMSMessage_Destroy(cmsg); for (i=0;recipient_certs[i];i++) CERT_DestroyCertificate(recipient_certs[i]); PORT_FreeArena(poolp, PR_FALSE); dw = camel_data_wrapper_new(); camel_data_wrapper_construct_from_stream(dw, ostream); camel_object_unref(ostream); dw->encoding = CAMEL_TRANSFER_ENCODING_BINARY; ct = camel_content_type_new("application", "x-pkcs7-mime"); camel_content_type_set_param(ct, "name", "smime.p7m"); camel_content_type_set_param(ct, "smime-type", "enveloped-data"); camel_data_wrapper_set_mime_type_field(dw, ct); camel_content_type_unref(ct); camel_medium_set_content_object((CamelMedium *)opart, dw); camel_object_unref(dw); camel_mime_part_set_disposition(opart, "attachment"); camel_mime_part_set_filename(opart, "smime.p7m"); camel_mime_part_set_description(opart, "S/MIME Encrypted Message"); camel_mime_part_set_encoding(opart, CAMEL_TRANSFER_ENCODING_BASE64); return 0; fail: if (ostream) camel_object_unref(ostream); if (cmsg) NSS_CMSMessage_Destroy(cmsg); if (bulkkey) PK11_FreeSymKey(bulkkey); if (recipient_certs) { for (i=0;recipient_certs[i];i++) CERT_DestroyCertificate(recipient_certs[i]); } PORT_FreeArena(poolp, PR_FALSE); return -1; }
static int sm_sign(CamelCipherContext *context, const char *userid, CamelCipherHash hash, CamelMimePart *ipart, CamelMimePart *opart, CamelException *ex) { int res = -1; NSSCMSMessage *cmsg; CamelStream *ostream, *istream; SECOidTag sechash; NSSCMSEncoderContext *enc; CamelDataWrapper *dw; CamelContentType *ct; switch (hash) { case CAMEL_CIPHER_HASH_SHA1: case CAMEL_CIPHER_HASH_DEFAULT: default: sechash = SEC_OID_SHA1; break; case CAMEL_CIPHER_HASH_MD5: sechash = SEC_OID_MD5; break; } cmsg = sm_signing_cmsmessage((CamelSMIMEContext *)context, userid, sechash, ((CamelSMIMEContext *)context)->priv->sign_mode == CAMEL_SMIME_SIGN_CLEARSIGN, ex); if (cmsg == NULL) return -1; ostream = camel_stream_mem_new(); /* FIXME: stream this, we stream output at least */ istream = camel_stream_mem_new(); if (camel_cipher_canonical_to_stream(ipart, CAMEL_MIME_FILTER_CANON_STRIP |CAMEL_MIME_FILTER_CANON_CRLF |CAMEL_MIME_FILTER_CANON_FROM, istream) == -1) { camel_exception_setv(ex, CAMEL_EXCEPTION_SYSTEM, _("Could not generate signing data: %s"), g_strerror(errno)); goto fail; } enc = NSS_CMSEncoder_Start(cmsg, sm_write_stream, ostream, /* DER output callback */ NULL, NULL, /* destination storage */ NULL, NULL, /* password callback */ NULL, NULL, /* decrypt key callback */ NULL, NULL ); /* detached digests */ if (!enc) { camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Cannot create encoder context")); goto fail; } if (NSS_CMSEncoder_Update(enc, (char *) ((CamelStreamMem *)istream)->buffer->data, ((CamelStreamMem *)istream)->buffer->len) != SECSuccess) { NSS_CMSEncoder_Cancel(enc); camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Failed to add data to CMS encoder")); goto fail; } if (NSS_CMSEncoder_Finish(enc) != SECSuccess) { camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM, _("Failed to encode data")); goto fail; } res = 0; dw = camel_data_wrapper_new(); camel_stream_reset(ostream); camel_data_wrapper_construct_from_stream(dw, ostream); dw->encoding = CAMEL_TRANSFER_ENCODING_BINARY; if (((CamelSMIMEContext *)context)->priv->sign_mode == CAMEL_SMIME_SIGN_CLEARSIGN) { CamelMultipartSigned *mps; CamelMimePart *sigpart; sigpart = camel_mime_part_new(); ct = camel_content_type_new("application", "x-pkcs7-signature"); camel_content_type_set_param(ct, "name", "smime.p7s"); camel_data_wrapper_set_mime_type_field(dw, ct); camel_content_type_unref(ct); camel_medium_set_content_object((CamelMedium *)sigpart, dw); camel_mime_part_set_filename(sigpart, "smime.p7s"); camel_mime_part_set_disposition(sigpart, "attachment"); camel_mime_part_set_encoding(sigpart, CAMEL_TRANSFER_ENCODING_BASE64); mps = camel_multipart_signed_new(); ct = camel_content_type_new("multipart", "signed"); camel_content_type_set_param(ct, "micalg", camel_cipher_hash_to_id(context, hash)); camel_content_type_set_param(ct, "protocol", context->sign_protocol); camel_data_wrapper_set_mime_type_field((CamelDataWrapper *)mps, ct); camel_content_type_unref(ct); camel_multipart_set_boundary((CamelMultipart *)mps, NULL); mps->signature = sigpart; mps->contentraw = istream; camel_stream_reset(istream); camel_object_ref(istream); camel_medium_set_content_object((CamelMedium *)opart, (CamelDataWrapper *)mps); } else { ct = camel_content_type_new("application", "x-pkcs7-mime"); camel_content_type_set_param(ct, "name", "smime.p7m"); camel_content_type_set_param(ct, "smime-type", "signed-data"); camel_data_wrapper_set_mime_type_field(dw, ct); camel_content_type_unref(ct); camel_medium_set_content_object((CamelMedium *)opart, dw); camel_mime_part_set_filename(opart, "smime.p7m"); camel_mime_part_set_description(opart, "S/MIME Signed Message"); camel_mime_part_set_disposition(opart, "attachment"); camel_mime_part_set_encoding(opart, CAMEL_TRANSFER_ENCODING_BASE64); } camel_object_unref(dw); fail: camel_object_unref(ostream); camel_object_unref(istream); return res; }